Wheeler Professional Retical Leveling System 2 Machined aluminum level housings;Barrel clamp level has non-marring pads to protect the gun and finish;Barrel clamp level is adjustable to fit around event he largest diameter barrels.;Each level has an integrated bubble level for precise measurementtable.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; } Item Category Code: 7900 Product Group Code: 7900C Inactive: No